Nils Svantesson Sture (b. 20 July 1543 at Hörningsholm Castle, d. 24 May 1567 in the Sture Murders at Uppsala Castle) was a Swedish diplomat and soldier during the reign of Erik XIV of Sweden.[1] He was the son of Svante Stensson Sture and Märta ("King Martha") Erikdotter Leijonhufvud.
His diplomatic missions included negotiations at the court of Elizabeth I of England in 1561, with John of Finland in 1562, and at the court of Lorraine in 1566/67.[1] As a soldier, he participated in the Nordic Seven Years War's battles of Varberg and Axtorna, where he was wounded, and in the Siege of Bohus.[1]
Sture fell into disgrace twice, due to Erik XIV's general distrust of the aristocracy[1] and his astrology-based fear that Sture might usurp his throne.[2] On 15 June 1566, after a death sentence Sture had received was commuted, he was publicly humiliated in Stockholm, where he was forced to ride a wretched hack through town with a straw crown on his head.[2] On 21 May 1567, returning from his final mission in Lorraine,[1] he was arrested again in Uppsala Castle. In what became known as the Sture Murders (Sturemorden), he was murdered in his cell three days later by Erik XIV in person.[3]